Structure and inner electrical connection

The radiator blind drive is a direct current motor. The engine control system is connected via LIN bus (Local Interconnect Network bus) to the radiator blind drive.

The radiator shutter drive is activated via a pulse-width modulated signal (PWM signal) from the engine control system. The radiator shutter has 2 positions: opened and closed. The radiator blind drive is supplied with voltage via the junction box.

Fig 1: Evaluation Electronics - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.